首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   19030篇
  免费   5335篇
  国内免费   67篇
耳鼻咽喉   65篇
儿科学   401篇
妇产科学   1603篇
基础医学   239篇
口腔科学   139篇
临床医学   15286篇
内科学   2219篇
皮肤病学   57篇
神经病学   610篇
特种医学   210篇
外科学   1038篇
综合类   49篇
一般理论   1篇
预防医学   1690篇
眼科学   30篇
药学   179篇
中国医学   1篇
肿瘤学   615篇
  2024年   74篇
  2023年   766篇
  2022年   88篇
  2021年   227篇
  2020年   606篇
  2019年   196篇
  2018年   1068篇
  2017年   1333篇
  2016年   1394篇
  2015年   1466篇
  2014年   1504篇
  2013年   1734篇
  2012年   429篇
  2011年   688篇
  2010年   1045篇
  2009年   1328篇
  2008年   649篇
  2007年   560篇
  2006年   571篇
  2005年   473篇
  2004年   426篇
  2003年   367篇
  2002年   314篇
  2001年   476篇
  2000年   280篇
  1999年   425篇
  1998年   585篇
  1997年   688篇
  1996年   638篇
  1995年   572篇
  1994年   422篇
  1993年   336篇
  1992年   269篇
  1991年   261篇
  1990年   257篇
  1989年   206篇
  1988年   156篇
  1987年   148篇
  1986年   136篇
  1985年   158篇
  1984年   114篇
  1983年   122篇
  1982年   89篇
  1981年   95篇
  1980年   59篇
  1979年   90篇
  1978年   76篇
  1977年   87篇
  1976年   78篇
  1972年   90篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
Objective To develop and evaluate the effectiveness of a breast cancer prevention decision aid for women aged 50 and older at higher risk of breast cancer. Design Pre‐test–post‐test study using decision aid alone and in combination with counselling. Setting Breast Cancer Risk Assessment Clinic. Participants Twenty‐seven women aged 50–69 with 1.66% or higher 5‐year risk of breast cancer. Intervention Self‐administered breast cancer prevention decision aid. Main outcome measures Acceptability; decisional conflict; knowledge; realistic expectations; choice predisposition; intention to improve life‐style practices; psychological distress; and satisfaction with preparation for consultation. Results The decision aid alone, or in combination with counselling, decreased some dimensions of decisional conflict, increased knowledge (P < 0.01), and created more realistic expectations (P < 0.01). The aid in combination with counselling, significantly reduced decisional conflict (P < 0.01) and psychological distress (P < 0.02), helped the uncertain become certain (P < 0.02), and increased intentions to adopt healthier life‐style practices (P < 0.03). Women rated the aid as acceptable, and both women and practitioners were satisfied with the effect it had on the counselling session. Conclusion The decision aid shows promise as a useful decision support tool. Further research should compare the effect of the decision aid in combination with counselling to counselling alone.  相似文献   
102.
The process of leaving an abusive relationship involves repeated attempts at leaving and returning and is influenced by a number of individual characteristics and contextual factors. Leaving is an initial step in recovering from an abusive relationship, a process that also includes struggling for survival, grieving, and searching for the meaning of the experience. Nurses must recognize that recovering from an abusive relationship can be a lifelong process, and health care providers have unique opportunities to support a woman's recovery.  相似文献   
103.
104.
Background: For local anesthetics, the process of removal from the site of administration influences the duration of anesthesia and the risk for systemic toxicity to develop. The systemic absorption of epidural ropivacaine and the time profile of sensory and motor block were studied in healthy volunteers.

Methods: Nine persons simultaneously received 150 mg ropivacaine hydrochloride (7.5 mg/ml) epidurally and 40 mg deuterium-labeled (sup 2 H sub 3)ropivacaine hydrochloride (0.25 mg/ml) intravenously. Peripheral arterial and venous plasma samples were collected, and assessments of sensory and motor block were made.

Results: The arterial plasma concentrations increased faster than the venous concentrations, with 50% higher maximum concentrations after both intravenous and epidural administration. The absorption was biphasic. A correlation was seen between the duration of sensory block and the slower absorption half-life; that is, the longer the half-life, the longer the duration. The extent of spread varied among the volunteers, with the median upper block level not exceeding T12. The motor block (Bromage score 1) was of slower onset (median, 0.4 h) and of shorter duration (median, 4.1 h) than the sensory block (onset, 0.2 h; duration, 6.5 h at L2 medians).  相似文献   

105.
106.
107.
108.
Cardiac arrhythmias are a well known cause of mortality for patients with heart disease. However, sinus tachycardia is a more unusual arrhythmia which can lead to serious heart damage or death. Even young patients with structurally normal hearts may become gravely ill.

This case study outlines the condition of sinus tachycardia, and associated changes in heart function, altered cellular structure of the myocardium and compensatory mechanisms in the body. Treatment modalities, including electro-physiological studies and drug therapies to moderate the tachycardia and myocardial oxygen demand of the heart, are discussed. Fourteen year old ‘Ben’ was previously a well, active and outgoing youth who suddenly became critically ill. He endured weeks of hospitalisation, numerous serious complications including Torsade de pointes arrhythmia, Cheyne-Stokes respirations, nausea and dizziness during this acute phase. Despite challenges, Ben's severely compromised heart muscle recovered at a remarkable rate.  相似文献   

109.
This article describes maternal and child care practices among women from India. As in all cultures, certain beliefs exist surrounding what facilitates a good pregnancy and its outcome, as well as negative sanctions. These practices continue to influence many immigrant women to whom western practices are either unknown or unacceptable. An understanding of the traditional belief system of such women can ease their adaptation into the Canadian and U.S. health care systems.  相似文献   
110.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号